Don't compute a composited selection for a detached frame

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 864a48ab8f89a7f26355693749fd482c95961591..bdfc0511dc17d0aaf016c70cff5ee1f1ba54b9e5 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -1623,7 +1623,7 @@ void FrameView::updateLayersAndCompositingAfterScrollIfNeeded()
 
 bool FrameView::computeCompositedSelection(LocalFrame& frame, CompositedSelection& selection)
 {
-    if (frame.view()->shouldThrottleRendering())
+    if (!frame.view() || frame.view()->shouldThrottleRendering())
         return false;
 
     const VisibleSelection& visibleSelection = frame.selection().selection();